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# Thiago Henrique Gomes Lobato

##### Last seen: 18 days ago
204 total contributions since 2019

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I can't find the mistake in the code
You can't use "abs" since the coefficients/x values can be negative.

2 months ago | 0

Average of 2 sets of random numbers
Take a look at the binomial generator, it does what you want to.

2 months ago | 1

Add each row of a matrix consecutively to all the rows of other matrix where both have equal number of columns
You can avoid the loop by using repeated indexing: IndexesA = 1:size(A,1); IndexesA = sort( [IndexesA,IndexesA] ); % IndexesA=...

2 months ago | 0

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Finding 5th to 15th central moment
The std function has a bias correction which the kurtosis doesn't, if you remove it you get the same result: rng(31415) A = ...

3 months ago | 2

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Extracting numeric values from symbolic variables
x==c The "==" operator is normally used as a logic comparison operation, not an assignment. In the case of using symbolic varia...

3 months ago | 0

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How to extract detail data from matlab Plot?
If you plot only 118 points you can't get more from the plot. The results are interpolated and probably what you want is a conti...

3 months ago | 0

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False Output from find-function?
max(A) is a vector, not a number: max(A) ans = Columns 1 through 15 1.0000 1.0000 1.0000 1.0000 1.0000...

3 months ago | 1

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How can I write a Matlab code on Digital Signals Processing ?
This should work for you, the code is almost self explanatory: L = 1024; Periods = 4; M = 128; A = 1; figure,plot( squareWa...

3 months ago | 0

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Curve to fit a loglog graph and its equation
There are some issues with your fit. First, log(0) is not defined, so what you expect to become from a fit that uses log(0)? If ...

3 months ago | 0

How wide range do optimalisation algorithms cover?
All of them except fmincon are unconstrained optimization algorithms, which means they can have any possible value in the group ...

3 months ago | 0

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In intlinprog how can I put condition for x = 1 or 0
You use a lower and upper bound of 0 and 1, respectively. Then if your number is an integer and should be between 0 and 1, the o...

3 months ago | 0

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How to display matlab plots in a GUI in python using api engine?
I don't think any python GUI has a canvas which can handle matlab plots directly. What you can do is to save your matlab plot as...

3 months ago | 0

Matlab App designer 20190a
A push button cannot "stay pushed", as soon as you click it the callback is called and then the state is reset. If what you mean...

3 months ago | 0

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How to give conditions on transformations of variables in cvx?
As far as I know the Cvx library doesn't accepts fft/ifft. What you can do is to calculate the ifft by "brute force" in a way th...

4 months ago | 0

retrieve phase information using 'pspectrum'
Why you need the phase? The pspectrum function calculates the power spectrum, which depends on the absolute square of the fft, s...

4 months ago | 0

Finding the probability of a given x-value on a histogram
If your dataset has discrete values, you don't need to get the histogram, rather just count how many times the median appear and...

4 months ago | 0

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Make a standalone app
It can be both. With appdesigner you can either create an matlab app (that will run in any other matlab), a web application or a...

4 months ago | 1

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regression analysis of lagged days
Your first argument should be a matrix with all the variables you need for prediction. So, in your case, you need to form a matr...

4 months ago | 0

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implementation of a matrix
This should do: rng(42) n = 3; x = rand(n,1); A = ones(n,n+1); Differences = x-x'; for idx=2:n+1 A(:,idx) = A(:,idx-1)...

4 months ago | 0

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How to calculate steady state with fsolve with white noise in equations ?
That depends on how you define Steady state. If your derivatives are never actually zero, you will never have a fully perfect st...

4 months ago | 1

Support Vector Machine: Linear or Non-linear
SVM is always linear in the parameters, but using non-linear kernels allows it to consider non-linear relations between the data...

5 months ago | 0

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Plot the STFT spectrogram
The function tutorials of matlab normally give code examples and results. For you to reproduce the result you just need to run t...

5 months ago | 1

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Map triplets to a matrix
You can try the ismembertol function: [XX,YY] = meshgrid(0:0.1:1,0:0.1:1); Points = [XX(:),YY(:)]; PointsToMatch = [0,0; ...

5 months ago | 0

Finding the mean of a histogram
What do you mean by mean? The mean number of bins or the mean of the variables that the histogram represents? For the second you...

5 months ago | 0

How to compute the density of a 3D point cloud?
You can just directly apply the definition you gave considering that the density is N/Volume. The easiest is the second one, whi...

5 months ago | 1

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Group array in a cell according to their size
A direct implementation could be done like this: A={[1 2 3 4] [4 5 6 9] [1 2 3] [7 8 9] [1 2] [3 4]}; sizes= []; for idx=1:...

5 months ago | 1

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How to fit one variable data into multiple ode equations
What you mean by y(1)? That you have data only for the first variable y1? Your equations seem to be coupled, so if you optimize ...

5 months ago | 0

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How write these equation in Matlab for optimization
First you don't need the variable w, your problem is to maximize corr(Q,S), which is a unconstrained problem in x. Second, by yo...

5 months ago | 0

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Evaluate Function at different data points from vectors
Use meshgrid to generate all combinations and make your function accept vector entries. Ex: f = @(x,y,z)x.*y+z; % Insert your ...

5 months ago | 0

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